I used to work once with a guy who had a gambling problem. Every lunch time he would slink off down the bookies. Nice bloke, and his modus operandi was to never bet more than he was prepared to lose.
So, in your case ask yourself the same question. If you can then there is no reason why you shouldn't persue a dream. As said before TP operators have no problem employing people of advancing years, just don't set your sights on being a 747 skipper.
In the end only you can answer this question, but if you trawl through search engine with "Am I too Old" you will find many people are in the same situation as you and the advice given is well balanced and sound.
Good Luck anyhoo.